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With the upcoming expansion announcement, figured I'd look into historical timespan between expansion announcement and release, so I updated the original spreadsheet above and added a new chart:

Now granted we've never had so few raid tiers, so it's a good guess I'd say that all the effort that (probably) went into the third raid tier content for Warlords of Draenor was just moved to the next expansion cycle instead.

Regardless, the shortest time between announcement and actual release was 340 days for MoP, soooooo, good luck Blizz! ><